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L B I-31864
DESCRIPTION
The Ericsson GE Vehicular Charger Units convert an M-
PA, M-PD or TPX Personal Series radio into a mobile con-
figuration when the radio unit is latched into the charger. It
may be used to charge a battery pack only, as a Monitor Re-
ceiver and battery charger, or as a two way vehicular radio
and battery charger. The Vehicular Charger connects the ra-
dio to an external antenna and provides a full 12 watts audio
output to an external speaker. It will recharge the Standard,
High or Extra High capacity batteries.
The external antenna, microphone, PTT circuit, speaker,
and charging contacts are automatically connected when the
radio is latched into the charger. Radio Detect switch S1, lo-
cated in the battery compartment, applies power to the
charging circuit when the radio is inserted. A second switch
senses the size of the battery pack and adjusts the charging
rate accordingly.
Heat sensors constantly monitor the temperature of both
the battery pack and the charging insert. When a cold battery
pack is inserted into the charging insert, the charger will wait
until the battery pack has warmed up to within about 10°C
of ambient. The charger will then, automatically, apply the
high charge rate. When the battery pack overcharges enough
to heat the cells 10°C above ambient, the charger will switch
from fast charge to trickle charge.
The charger also has a memory that is set when the
charger switches from the high charging rate to the trickle
charge rate, and is reset when the battery pack is removed
from the charging insert. If a hot battery is in the charging
insert and the memory has not been reset, the charger will
remain at the trickle charge rate. If the memory has been re-
set the charger will wait until the battery pack has cooled be-
fore automatically switching to fast charge. If a fully charged
battery pack is removed from the charging insert and then
reinserted, it will charge for about 1/2 hour until the cell re-
heats.
A voltage cut off circuit also has been incorporated to
prevent overcharging and " gassing" of the battery pack.
Battery voltage is constantly monitored and, if the battery
pack charge terminal voltage exceeds 9.5 volts, high rate is
terminated and the LED READY light is turned on.
If the VOLUME switch (attached to the rotary volume
control) is in the OFF position, only the charging function
operates regardless of the latch position.
If the radio is not latched, and the ON/OFF switch on the
radio is on, audio will be heard from the radio speaker.
Note: The radio must have been turned on before being in-
serted into the charger. The external microphone, speaker,
2
and outside antenna are not connected until the latch is en-
gaged.
If the VOLUME switch is on, when the radio is latched,
the speaker, microphone and antenna in the personal radio
are disconnected and connections are automatically made to
the charger and its external microphone, speaker, and an-
tenna. In addition, latching the radio causes the power
switch to be turned on, supplying voltage to the audio ampli-
fier and dead battery power supply. It also turns the RADIO
ENGAGED LED on. The personal radio is powered on re-
gardless of the position of its power switch.
If the radio is turned off (switch on battery), latching the
radio into the charger turns on a regulated 8.0 volt power
supply which powers the portable radio while the battery is
being charged. Dead battery operation is provided during
transmit by connecting the 8.0 volt power supply across the
battery during PTT operation.
OPERATION
Temperature characteristics of nickel cadmium batteries,
prevent a full charge at temperature extremes. For a maxi-
mum charge, recharge the battery pack at ambient room tem-
perature or between 65 and 85 degrees F.
CAUTION
The Vehicular Charger is designed to recharge the
Standard, High, and Extra High capacity battery
pack. Attempting to recharge any other battery pack
or batteries may result in damage to equipment,
leakage, or explosion.
Four indicators provide status information for the
charger/radio combination. A red LED indicator, RADIO
ENGAGED, turns on when the radio is inserted properly
into the charger and a second red indicator labeled CHARG-
ING will light, indicating the battery is being charged. When
the battery pack is fully charged a green LED indicator la-
beled READY will light and the charger will automatically
switch from a rapid charge rate to a trickle charge rate. A red
XMIT indicator lights when the external PTT switch is
pressed, indicating the transmitter is keyed. (The radio must
be properly engaged). Refer to Figure 1 for location of con-
trols and indicators.
Figure 1 - Vehicular Charger
Three operational modes are possible:
• Charge battery pack only
• Monitor receive frequency (s) only and charge battery
pack.
• Full radio operation and charge battery pack.
CHARGE ONLY
The following procedures will permit recharging of the
portable radio unit battery pack only. No activation of the ve-
hicular charger POSILATCH™ or the VOLUME switch is re-
quired.
1.
Set power switch on portable radio unit battery pack
to OFF position.
2.
Insert portable radio unit into charging compartment
with its speaker facing outward (see Figure 2.).
L B I-31864
3.
The red CHARGE indicator will light and remain lit
until the portable radio unit is removed or until the
vehicular charger unit circuits sense that the battery
pack has reached total charge capacity, at which time
the green READY indicator will also light, indicating
that the charger has switched to trickle charge rate.
4.
Remove the portable radio unit from the charger com-
partment as shown in Figure 2.
CAUTION
DO NOT use the antenna to remove the port-
able radio from the charging compartment.
CHARGE AND MONITOR
The following procedures will permit recharging of the
portable radio unit battery pack and also permit the radio to act
as a monitor receiver. No activation of the vehicular charger
POSILATCH or the VOLUME switch is required.
NOTE
The portable radio is not connected to the external
antenna in this mode.
1.
Set power switch on the portable radio unit battery
pack to ON position.
2.
Insert portable radio unit into charging compartment
with its speaker facing outward (see Figure 2.).
3.
The red CHARGE indicator will light and remain lit
until the portable radio unit is removed or until the
vehicular charger unit circuits sense that the battery
pack has reached its total charge capacity, at which
time the green READY indicator will also light, indi-
cating that the charger has switched to trickle charge
rate.
4.
Remove the portable radio unit from the charger com-
partment as shown in Figure 2.
CAUTION
DO NOT use the antenna to remove the port-
able radio from the charging compartment.
*™ Trademark of General Electric Company
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